Homogeneous Coordinates: They work, but where do they come from?
AMS-MAA Joint Mathematics Meetings, January 2008. During the
MAA session on Innovative
and Effective Ideas in Teaching Linear Algebra I presented a talk on
homogeneous coordinates that is appropriate for students in an introductory
linear algebra course after they've seen bases and coordinate vectors.
Available in PDF or OpenOffice.org Impress
format.